(1) There should be a clear understanding of heavy-duty scaffolding. Generally, if the thickness of the floor slab exceeds 300mm, it should be thought about in accordance with the heavy-duty scaffolding design. The scaffolding load exceeds 15KN/㎡, and the design plan should organize expert demonstration. It is necessary to distinguish the steel pipe length changes in those parts that have a greater impact on the load bearing. Regarding the formwork support, it should be considered: the length a between the center line of the top bar and the formwork support point should not be too long, generally less than 400mm is appropriate (in the new standard The revision may be stopped), the uppermost step and the lowermost step usually bear the greatest force during the calculation of the pole, which should be used as the main calculation point. When the bearing capacity is not satisfied with the request of the group, the vertical pole should be increased to reduce the vertical and horizontal spacing, or the degree pole should be increased to reduce the step distance. (2) Domestic scaffolding generally has unqualified materials such as steel pipes, fasteners, top support and bottom support. These are not considered in theoretical calculations in practical construction. It is best to take a certain safety factor in the design calculation process. construction
(3) The sweeping pole is missing, the vertical and horizontal junctions are not connected, the distance between the sweeping poles is too large or too small, etc.; the scaffold board is cracked, the thickness is not enough, and the overlap does not meet the standard requirements; after the large formwork is removed, the inner pole and the wall There is no anti-falling net between them; the scissor support is not continuous in the plane; the open-tooth scaffold is not equipped with diagonal braces; the spacing of the small crossbars under the scaffolding board is too large; the connecting wall parts are not rigidly connected between the inside and the outside; the spacing between the protective railings is greater than 600mm; the fasteners are connected Not tight, slippage of fasteners, etc. (4) Partial deformation of the scaffold caused by the settlement of the foundation. On the transverse section of the double-breasted frame, set up a stilt or scissor brace, and set up a set of vertical rods every other row until the deformation zone is outside. The horoscope or scissor support foot must be set on a solid and firm foundation. (5) The deflection and deformation of the cantilevered steel beam on which the scaffolding is rooted exceeds the rule value. The anchorage point of the cantilevered steel beam should be stopped and reinforced, and the steel beam should be tightened with steel supports and U-shaped brackets to withstand the roof. There is a gap between the pre-embedded reinforcement ring and the steel beam, which must be secured with a horse wedge. The steel wire ropes at the outer ends of the hanging steel beams are checked one by one, and all are tightened to ensure the average force. (6) The scaffolding unloading and tensioning system is partially damaged. It should be restored immediately according to the unloading and tensioning method formulated in the original plan, and the deformed parts and rods should be corrected. If correcting the deformation of the scaffolding outwards, first set a 5t rewinding chain for each bay, tighten the structure, loosen the rigid pull contact, and tighten the rewinding chain inward at all points at the same time, until the deformation is corrected, and the rigid pull is done. Then, tighten the wire ropes at each unloading point to make the force evenly, and finally release the chain.
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